But there's one factor masking DISH Network's subscriber losses. Its over-the-top Sling TV subscribers are lumped into the same subscriber category as its traditional satellite TV subscribers. With the impending launch of competing over-the-top services from AT&T, Hulu, and YouTube, Sling TV probably won't be able to bolster DISH's subscriber numbers as much.

How big is Sling TV?

DISH's management won't disclose how many Sling TV subscribers it counts. It reportedly had around 600,000 subscribers by the end of last year. Analyst Craig Moffett believes the company gained another 135,000 in the first quarter, 49,000 in the second quarters, and an additional 204,000 in the third quarter.

Those estimates bring Sling's subscriber count close to 1 million. DISH's total subscriber count fell to 13.643 million at the end of the third quarter, so Sling is now a meaningful portion of its total subscriber count.

Interestingly, Sling's lower subscription price hasn't prevented DISH from raising its prices on its satellite TV subscribers. DISH's average revenue per subscriber climbed 3.6% year over year to $89.44 per month. Additionally, management claims it's able to generate similar operating profit from Sling TV compared with its satellite business because of lower customer acquisition costs. Indeed, operating income climbed 12% year over year last quarter.

Sling TV

The competition is coming

AT&T is expected to launch DirecTV Now later this month. The service will provide about 100 channels for just $35 per month. Comparatively, Sling has a couple of tiers priced at $20 per month and $25 per month that offer between 20 and 30 channels, or you can subscribe to both for $40 per month.

AT&T is able to leverage its size as the largest pay-TV provider in the U.S. to keep its costs down. Additionally, it has nearly 80 million phone customers it can market its television service too. In fact, AT&T has already been taking advantage of its position in the wireless market to drive more customers to DirecTV's satellite business. It's planning to allow its wireless customers to stream DirecTV Now without it counting against their data caps (although the FCC recently voiced concern over that policy). If it's able to do that, it's a serious competitive advantage over other streaming services.

What's more, Hulu and YouTube plan to launch similar services. Hulu has a market of 12 million subscribers to sell into. YouTube has hundreds of millions of people coming to its website every day. The marketing power and reach of each company doesn't bode well for Sling TV.

For DISH, that means growing Sling TV subscribers will become increasingly difficult. And with the losses it's taking from its satellite business, that means subscriber losses could continue well into next year as it looks to get its footing.

With the pressure on prices from services like DirecTV Now, it's unclear whether investors can expect it to continue increasing its average revenue per subscriber. The combination means slower revenue growth and pressure on operating margins.